EP1865642A1 - Funkkommunikationseinrichtung und funkkommunikationsverfahren - Google Patents

Funkkommunikationseinrichtung und funkkommunikationsverfahren Download PDF

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Publication number
EP1865642A1
EP1865642A1 EP06730053A EP06730053A EP1865642A1 EP 1865642 A1 EP1865642 A1 EP 1865642A1 EP 06730053 A EP06730053 A EP 06730053A EP 06730053 A EP06730053 A EP 06730053A EP 1865642 A1 EP1865642 A1 EP 1865642A1
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EP
European Patent Office
Prior art keywords
antennas
transmission
radio communication
antenna
unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06730053A
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English (en)
French (fr)
Other versions
EP1865642A4 (de
Inventor
Kenichi IP Dpt. NTT DoCoMo Inc. HIGUCHI
Noriyuki IP Dpt. NTT DoCoMo Inc. MAEDA
Mamoru IP Dpt. NTT DoCoMo Inc. SAWAHASHI
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NTT Docomo Inc
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NTT Docomo Inc
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Publication date
Application filed by NTT Docomo Inc filed Critical NTT Docomo Inc
Publication of EP1865642A1 publication Critical patent/EP1865642A1/de
Publication of EP1865642A4 publication Critical patent/EP1865642A4/de
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
    • H04B7/0669—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal using different channel coding between antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0689—Hybrid systems, i.e. switching and simultaneous transmission using different transmission schemes, at least one of them being a diversity transmission scheme
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H04L1/0013—Rate matching, e.g. puncturing or repetition of code symbols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding
    • H04L1/0637—Properties of the code
    • H04L1/0643—Properties of the code block codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H04L1/1819—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of additional or different redundancy
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0665—Feed forward of transmit weights to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0057—Block codes

Definitions

  • the present invention relates to a technical field of radio communication, and especially relates to a radio communication apparatus and a radio communication method that are used in a multi-antenna system.
  • multi-antenna systems and multi-antenna transmission methods have been proposed for future mobile communications systems from viewpoints of improvements in speed, quality, etc., of information transmission.
  • data transmission is carried out using two or more antennas for transmission and/or reception, wherein not only frequency and time but also space is effectively utilized.
  • the multi-antenna transmission methods generally include a MIMO (Multiple Input Multiple Output) multiplexing method, a MIMO diversity method, and an adaptive array antenna (AAA: Adaptive Array Antenna) method.
  • the concept of the MIMO diversity method is described with reference to Fig. 1B.
  • the MIMO diversity method is a technique for improving reliability on the reception side by transmitting two or more streams of the same contents in parallel from two or more transmission antennas.
  • Fig. 1B when transmitting symbols A and B, one antenna transmits in a sequence of B and A, and another antenna transmits in a sequence of A* and -B*.
  • "-" is a negative sign
  • "*" represents a complex conjugate.
  • STBC space-time block coding
  • the concept of the adaptive array antenna method is described with reference to Fig. 1C.
  • the adaptive array antenna method two or more antennas are used, and the same number of copies of the same symbol sequence is produced for transmission, wherein each copy is multiplied by a corresponding transmission weight.
  • a directional beam that has a main lobe directed to a communication partner is formed, and the communication quality on the receiving side can be raised.
  • Fig. 5A shows simulation results.
  • the simulation of the MIMO multiplexing method and the MIMO diversity method was conducted under conditions that a base station used two transmission antennas, data transmission was carried out at 90 Mbps, and a bandwidth of 100 MHz was used. Further, it was assumed that the number L of multipaths was 6, the maximum Doppler frequency fD was 20 Hz, and a delay distribution ⁇ was 0.26 ⁇ s.
  • the horizontal axis of Fig. 5A represents average received power E b /N 0 per antenna of a mobile station. Therefore, a small value on the horizontal axis represents a situation wherein received power was small, which can be related to an area that was distant from a base station. On the contrary, a great value on the horizontal axis represents a situation wherein the received power was great, which can be related to an area near the base station.
  • the vertical axis of Fig. 5A represents the throughput (Mbps) that was attained at a point where the power as shown in the horizontal axis was measured. According to the present simulation, since the base station transmitted at 90 Mbps, the maximum throughput that could be attained was 90 Mbps.
  • Fig. 5B shows simulation results of the same case as Fig. 5A except that the transmission rate of the base station was different.
  • the case of 290 Mbps and the case of 380 Mbps were compared as the transmission rates of the base station.
  • a 16QAM system was used, and the encoding rate was made into 1/2; and for the MIMO diversity method, a 64QAM system was used, and the encoding rate was made into 2/3.
  • the objective of the present invention is to provide a radio communication apparatus and a radio communication method, whereby the throughput of the data transmission is improved in a multi-antenna system.
  • the throughput of the data transmission in a multi-antenna system can be raised.
  • the data modulating unit 304 is for modulating the data sequences. Modulation methods include BPSK, QPSK, 16QAM, and 64QAM. A modulation method is selected by the transmission method control unit 316.
  • each antenna outputs a different symbol; however, if the contents included in 2TTI are compared, only the information about the symbols A and B are contained.
  • Such space-time coding or linear processing is performed by the space-time coding unit 317.
  • the combining units 314-1 and 2 combine a control signal and the signal transmitted from the transmission antenna, if needed. Combining may be performed by one or more of time multiplexing, frequency multiplexing, and code multiplexing.
  • the transmission method control unit 316 is for determining a transmission method based on the number N TX of the transmission antennas, the number N RX of the receiving antennas, reception SIR, and a fading correlation value. Contents that are determined include the modulation method and the encoding rate that are to be used for transmission. Further, the contents that are determined include a transmission method that is to be used by the transmitter 300; namely, the adaptive array antenna method, the MIMO diversity method, or the MIMO multiplexing method.
  • Reception SIR is an example of the received signal quality measured by the communication partner (typically a mobile station). Not only SIR, but other suitable channel state information (CQI: Channel Quality Indicator) may be used.
  • the storage unit 318 is for storing a MCS table. That is, according to this embodiment, adaptive modulation and coding (AMC) is adopted, and a modulation method and an encoding rate are adjusted one by one. A general description about AMC is presented below with reference to Figs. 7, and 8.
  • the MCS table according to this embodiment includes not only combinations of reception SIR, modulation method, and encoding rate, but also corresponding relationships between each combination and a fading correlation value. At least three MCS tables are prepared according to this embodiment.
  • the MCS tables are related to the transmission methods, namely, the beam forming method, the MIMO diversity method, and the MIMO multiplexing method.
  • ENC is an encoding unit for encoding by, for example, a turbo code and a convolutional code.
  • the transmitter includes a CRC unit into which PD is input, ENC that is connected to the CRC unit, RM connected to ENC, S/P connected to RM, and MOD into which a signal that is serial/parallel converted by S/P is input for each antenna.
  • the AMC process can be performed based on a level difference, for example, a difference of received power between the antennas in an actual implementation so that a good data channel characteristic is acquired. Further, when a coding unit goes beyond an antenna, a good data channel characteristic is acquired by performing rate control for each antenna only in the modulation as described above. When transmitting channel coded data from two or more antennas by frequency blocks, a better characteristic can be obtained by changing the modulation method, rather than changing the encoding rate.
  • the HARQ process is commonly performed for the antennas, and a good data channel characteristic is acquired by the diversity.
  • the transmitter may be configured as shown in Fig. 9C (Configuration C) such that the adaptive modulation/demodulation process may be independently performed for each antenna (this is called antenna independent AMC), and antenna common HARQ may be performed.
  • the AMC process can be performed based on the level difference between the antennas, for example, the difference of received power; accordingly, a good data channel characteristic is obtained. Further, since the rate control for each antenna is performed only by modulation in this way, a good data channel characteristic is acquired when a coding unit goes beyond an antenna.
  • a better characteristic is obtained by changing the modulation method rather than by changing the encoding rate.
  • the receiving unit 1008 for beam forming includes a maximum ratio combining unit 1011, and a data demodulating unit 1013.
  • the maximum ratio combining unit 1011 combines signals received with the antennas so that the gain may be maximized.
  • maximum ratio combining is used in this embodiment, other combining methods commonly known in the technical field may be used. For example, a signal from an antenna that is better is selected, and the other signal may be discarded.
  • the data demodulating unit 1013 demodulates the data according to the determined modulation method and the determined encoding rate, and outputs the demodulated data.
  • the channel decoding unit 1014 outputs the demodulated data after performing error correction.
  • control bits required of the MIMO transmission there are AMC bits, HARQ bits, a bit for scheduling, and CQI for MIMO.
  • the control information transmitting unit 320 compares an average CQI of the group 1 with an average CQI of the group 2, and reports the CQI of the two antennas of a group that has the greater average CQI.
  • the control information transmitting unit 320 controls such that information for all the antennas may be transmitted within one frame as shown in Fig. 19A. Further, the control information transmitting unit 320 may be configured such that the information for all the antennas may be transmitted within one slot. In this way, increase of control delay can be prevented when transmitting the control information with two or more antennas.
  • control information transmitting unit 320 may be configured to transmit different information for antennas in each frame in sequence as shown in Fig. 19B. Further, the control information transmitting unit 320 may be configured to transmit different information for antennas in sequence in each slot. In this way, the same control channel configuration as the case where transmission is carried out with one antenna can be used. That is, it becomes unnecessary to change the control channel configuration for terminals that have different numbers of antennas. Further, the number of control bits can be made small.
  • Fig. 20 shows the outline of the method performed by the multi-antenna system according to the embodiment of the present invention.
  • the transmitter is a base station and the receiver is a mobile station is described, this is for convenience of description, and the present invention is not limited to such formation.
  • the number N RX of receiving antennas is reported to the transmitter from the receiver.
  • the number N RX of the receiving antennas does not have to be frequently transmitted to the transmitter, but is just once reported during communications. For example, it may be once reported at the time of establishing a radio link for the receiver.
  • the transmitter can obtain a suitable number of antennas for transmission by knowing the received number N RX of the receiving antennas, and the number N TX of the transmission antennas of the transmitter.
  • Fig. 22 schematically shows when changing the multi-antenna transmission method depending on the magnitude of the fading correlation value.
  • the fading correlation value is small (near 0)
  • the radio propagation paths of the transmission antennas are mutually dissimilar; accordingly, one of the MIMO diversity and the MIMO multiplexing method is used.
  • the fading correlation value is great (near 1)
  • the radio propagation paths of the transmission antenna are mutually similar; accordingly, the adaptive array antenna method is used.
  • Whether the radio propagation paths of the transmission antenna are similar is relatively determined based on not only antenna spacing but also a distance between the transmitter and the receiver and other environmental parameters.
  • the transmitter selects the MIMO multiplexing method, which is the transmission method that gives the greatest bit rate, and the modulation method and the encoding rate (QPSK, 1/2) corresponding to MCS2 are selected.
  • the MIMO multiplexing method is adopted from a viewpoint of raising reliability.
  • the transmission method control unit 316 may divide the assigned frequency band into two or more frequency blocks, and the frequency blocks may be assigned to two or more users in units of a frequency block.
  • the receiver performs a signal separating method based on the first received signal R 1 , and estimates a group of symbols transmitted from the four transmission antennas. Consequently, it is estimated that S1, -S2*, S3, and -S4* are first transmitted from the four transmission antennas. Further, the receiver performs the signal separating method based on the second received signal R 2 , and estimates a group of symbols transmitted from the four transmission antennas. Consequently, it is estimated that S 2 , S 1 *, S 4 , and S 3 * are next transmitted from the four transmission antennas. Contents of the two groups of the symbols are essentially the same (only the sign is different, or otherwise, it is a complex conjugate). Accordingly, the receiver can accurately estimate the four symbols S 1 , S 2 , S 3 , and S 4 .
  • the signal transmitted from each transmitter can be detected from the received signal. For example, as shown in Fig. 27A, points of a transmitted signal X and a transmitted signal Y are determined by a receiving signal Z.
  • the determining unit 412 is connected to the data modulating units 404 and the phase rotation table 410.
  • the phase rotation table 410 is connected to the phase rotating units 406.
  • Feedback information from the mobile station is provided to the determining unit 412.
  • the mobile station transmits information that shows CQI and the number of antennas as the feedback information.
  • the determining unit 412 determines a transmission antenna MCS of each antenna, and provides a number that identifies the determined MCS to the data modulating units 404 and the phase rotation table 410.
  • the RF circuit calibrating unit 414 provides calibration factors of the antennas (subcarriers) to the corresponding RF calibrating units 402.
  • the RF calibrating units 402 perform calibration according to the corresponding calibration factors.
  • a received signal is processed by the RF unit 502, and is provided to the signal separating unit 504, the channel estimating unit 508, and the downlink control channel demodulating unit 510.
  • the channel estimating unit 508 performs channel estimation using a pilot symbol, and a channel estimation value is provided to the transmission phase compensating unit 506 and the downlink control channel demodulating unit 510.
  • the signal separating unit 504 separates the received signal that has been processed by the RF unit based on the channel estimation value, which has been compensated for the phase angle, the number of transmission antennas, and data modulation information, and provides the separated signal to the channel decoding unit 514.
  • the parallel/serial converter 516 performs parallel-to-serial conversion of the provided signals. Consequently, an information-bit series is obtained.
  • a transmission signal point of the downlink pilot symbol is fixed, independent of the transmission phase control value of the data symbol. This is because the downlink pilot symbol is used for purposes such as cell detection of other users, and channel state estimation, in addition to demodulation of the user data.
  • the receiving apparatus 500 fading fluctuation between the transmission antennas and the receiving antenna is estimated based on the received signal points of the pilot symbol.
  • demodulating is carried out by performing the same receiving process as performed when there is no phase rotation of the data modulation of each antenna of the transmitting apparatus.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Transmission System (AREA)
EP06730053.3A 2005-03-31 2006-03-27 Funkkommunikationseinrichtung und funkkommunikationsverfahren Withdrawn EP1865642A4 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2005105494 2005-03-31
JP2005174393 2005-06-14
JP2005241904A JP4884722B2 (ja) 2005-03-31 2005-08-23 無線通信装置及び無線通信方法
PCT/JP2006/306105 WO2006106613A1 (ja) 2005-03-31 2006-03-27 無線通信装置及び無線通信方法

Publications (2)

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EP1865642A1 true EP1865642A1 (de) 2007-12-12
EP1865642A4 EP1865642A4 (de) 2016-01-06

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Country Status (8)

Country Link
US (1) US8416872B2 (de)
EP (1) EP1865642A4 (de)
JP (1) JP4884722B2 (de)
KR (1) KR101270986B1 (de)
CN (2) CN101171781B (de)
BR (1) BRPI0609537A2 (de)
TW (2) TW200943773A (de)
WO (1) WO2006106613A1 (de)

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EP3160062A4 (de) * 2014-06-19 2017-07-05 ZTE Corporation Vorrichtung und system zur erkennung und demodulation optischer signale
US11025394B1 (en) 2012-04-12 2021-06-01 Tarana Wireless, Inc. System architecture for optimizing the capacity of adaptive array systems
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US11831372B2 (en) 2012-04-12 2023-11-28 Tarana Wireless, Inc. Non-line of sight wireless communication system and method

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TR201907743T4 (tr) 2006-10-31 2019-06-21 Ericsson Telefon Ab L M Telekomünikasyon sistemi ve böyle bir sistemde hata kontrolü.
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EP1865642A4 (de) 2016-01-06
US20090213955A1 (en) 2009-08-27
CN101171781A (zh) 2008-04-30
CN101171781B (zh) 2012-11-07
BRPI0609537A2 (pt) 2010-04-13
CN102098088A (zh) 2011-06-15
JP4884722B2 (ja) 2012-02-29
CN102098088B (zh) 2013-02-27
TWI366358B (de) 2012-06-11
KR20070118256A (ko) 2007-12-14
KR101270986B1 (ko) 2013-06-05
JP2007028569A (ja) 2007-02-01
US8416872B2 (en) 2013-04-09
WO2006106613A1 (ja) 2006-10-12
TW200943773A (en) 2009-10-16

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